This Service Guide contains technical details for the IntelliVue MP40 and MP50 Patient Monitor, the measurement modules, the Multi- Measurement Server (MMS), and the Measurement Server Extensions. This guide provides a technical foundation to support effective troubleshooting and repair. It is not a comprehensive, in-depth explanation of the product architecture or technical implementation. It offers enough information on the functions and operations of the monitoring systems so that engineers who repair them are better able to understand how they work. It covers the physiological measurements that the products provide, the Measurement Server that acquires those measurements, and the monitoring system that displays them